The Differential Impact of Partial Sleep Deprivation on Specific Aspects of Positive and Negative Affect Among Healthy Adults
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- Institutt for psykologi 
The present study investigated the impact of sleep deprivation on positive and negative affective functioning in healthy adult participants (N = 51). Participants completed the Positive and Negative Affect Schedule (PANAS) under conditions of rest and sleep deprivation (habitual sleep time nightly for seven consecutive nights, followed by three consecutive nights with 2 hours less sleep time). Lower positive affect was observed when participants were sleep-deprived compared to rested. This effect held for 7 out of the 10 positive affect items on the PANAS, as well as for total positive affect. Further, Cohen's effect size values were small to large (d > 0.20) for 9 out of the 10 positive affect items on the PANAS. A large effect size for total positive affect was observed (d = 0.85). No change in negative affect existed when participants were sleep-deprived compared to rested. However, a small effect size (d > 0.20) was found for 7 out of the 10 negative affect items on the PANAS. These results both extend and support previous research underscoring the associations between sleep deprivation and affective functioning; however, further studies with larger samples should be conducted to validate the results.